TUESDAY Lisa Phillips is in town promoting her new book, Public Radio: Behind the Voices. It was unconfirmed at press time whether her reading would be interrupted by Kojo Nnamdi, asking for pledges. Olsson’s Books and Records, 418 7th St. NW., 7 p.m. WEDNESDAY There once was a poet named Trillin, Who, to D.C., came all a-shillin’ He does A Heckuva Job Tossing poetical globs Of poo at political villains. Politics and Prose, 5015 Connecticut…